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3 years ago

Need help on Chemistry

Chemistry

1 answer:

avanturin [10]3 years ago

8 0

You may find bellow the balanced chemical reactions.

Explanation:

To balance chemicals equation the number of atoms of each element

entering the reaction have to be equal to the number of atoms of each

element leaving the reaction, in order to conserve the mass.

2. Single displacement: Zn + 2 HCl → ZnCl₂ + H₂

3. Decomposition: NiCl₂ → Ni + Cl₂

4. Double displacement: 2 LiI + Pb(NO₃)₂ → PbI₂ + 2 LiNO₃

5. Double displacement: BaCl₂ + H₂SO₄ → BaSO₄ + 2 HCl

6. Single displacement: Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

7. Synthesis (combination): 2 Na + O₂ → 2 Na₂O

8. Solid mercury (II) oxide decomposes to form liquid mercury and oxygen.

2 HgO (s) → 2 Hg (l) + O₂ (g) (decomposition reaction)

9. A solution of zinc hydroxide reaction with phosphoric acid (H₃PO₄) to produce solid zinc phosphate and water.

3 Zn(OH)₂ + 2 H₃PO₄ → Zn₃(PO₄)₂ (s) + 6 H₂O (l) (double displacement reaction)

where:

(s) - solid

(l) - liquid

Learn more about:

types of chemical reactions

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Aqueous hydrochloric acid reacts with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . If of water i

Kaylis [27]

Answer:

87.9%

Explanation:

Balanced Chemical Equation:

HCl + NaOH = NaCl + H2O

We are Given:

Mass of H2O = 9.17 g

Mass of HCl = 21.1 g

Mass of NaOH = 43.6 g

First, calculate the moles of both HCl and NaOH:

Moles of HCl: 21.1 g of HCl x 1 mole of HCl/36.46 g of HCl = 0.579 moles

Moles of NaOH: 43.6 g of NaOH x 1 mole of NaOH/40.00 g of NaOH = 1.09 moles

Here you calculate the mole of H2O from the moles of both HCl and NaOH using the balanced chemical equation:

Moles of H2O from the moles of HCl: 0.579 moles of HCl x 1 mole of H2O/1 mole of HCl = 0.579 moles

Moles of H2O from the moles of NaOH: 1.09 moles of HCl x 1 mole of H2O/1 mole of NaOH = 1.09 moles

From the calculations above, we can see that the limiting reagent is HCl because it produced the lower amount of moles of H2O. Therefore, we use 0.579 moles and NOT 1.09 moles to calculate the mass of H2O:

Mass of H2O: 0.579 moles of H2O x 18.02 g of H2O/1 mole of H2O = 10.43 g

% yield of H2O = actual yield/theoretical yield x 100= 9.17 g/10.43 g x 100 = 87.9%

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3 years ago

Which common material is an example of a polyamide?

tamaranim1 [39]

The answer -

nylon....

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3 years ago

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A sample of gas exerts a pressure of 16 atm at a temperature of 340 K. What is the pressure of the gas in atm if the temperature

gavmur [86]

Answer:

P2 = 19.2atm

Explanation:

Initial pressure (P1) = 16atm

Initial temperature (T1) = 340K

Final temperature (T2) = 408K

Final pressure (P2) = ?

This question involves the use of pressure law

Pressure law states that the pressure of a fixed mass of gas is directly proportional to it's temperature provided that volume is kept constant.

Mathematically,

P = kT, k = P / T

Therefore,

P1 / T1 = P2 / T2 = P3 / T3 = ......=Pn / Tn

P1 / T1 = P2 / T2

We need to solve for P2

P2 = (P1 × T2) / T1

Now we can plug in the values and solve for P2

P2 = (16 × 408) / 340

P2 = 6528 / 340

P2 = 19.2atm

The final pressure (P2) of the gas is 19.2atm

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3 years ago

Complete the sentence. When a base is added to water, hydrogen ions __________.

kobusy [5.1K]

Answer:

Explanation:

Decreases

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2 years ago

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Draw the structure of the product for the reaction of propylmagnesium bromide with cyclohexanone. Assume that the reactions are

Nadya [2.5K]

Answer:

See explanation below

Explanation:

This reaction is known as the Grignard reaction. If's often used to add an alkyl to a molecule, in this case, a ketone. This also helps to reduce the carbonile to an alcohol.

The mechanism is taking place in 3 steps.

The first step involves the attack of the pair of electrons of the oxygen from the cyclohexanone to the MgBr, and the other pair takes the propyl.

The second step involves the breaking of this bond to have the OMgBr and the propyl attached to the carbon of the chain.

The last steps involves an hydration of the molecule, to turn the OMgBr into OH, and that would be the final product.

In this case, the final product will be 1-propyl-cyclohexanol.

The picture below, shows the mechanism and the drawing of the final product.

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3 years ago